US 20090134673 A1
A spring locking knob and a fixed stop at the upper ends of the front legs of a chair frame cooperate to restrict movement of a slideset joining the front legs, rear legs and seat support struts of a chair in making the chair more stable and resistant to an inadvertent folding closure.
1. In a folding chair, apparatus comprising;
a pair of front legs;
a pair of rear legs;
a seat support frame;
a first pivot connection between a middle part of said frame and a middle part on each of said front legs;
a second pivot connection between a rear part of said frame and a middle part of each of said rear legs;
a slidable bracket encircling each of said front legs above their middle parts;
a third pivot connections between the slidable bracket on each of said front legs and an upper part of each of said rear legs;
a spring knob on each of said front legs between the middle parts and upper parts thereof;
a recess in each of said slidable brackets to capture each of said spring knobs;
a fixed bracket encircling each of said front legs between each of said spring knobs and a top part of said front legs; and
a spring release on each of said fixed brackets to free each of said spring knobs;
whereby upwards movement of each of said slidable brackets is limited between each of said fixed brackets and said middle parts of said front legs.
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This Application corresponds to one filed Jun. 14, 2006 as PCT/CN/2006/001319.
Research and development of this invention and Application have not been federally sponsored, and no rights are given under any Federal program.
1. Field of the Invention
This invention relates to collapsible chairs, in general, and to those provided with a back support, in particular.
2. Description of the Related Art
One of the problems associated with a typical design for a collapsible chair provided with a back is that the chair is not entirely stable, firm and safe. As such, it exhibits a tendency to lose its center of gravity, causing injury to the body. As will become clear from the following description, the collapsible chair of the present invention overcomes such problem.
As will become clear, the collapsible chair of the first two embodiments of the present invention provides the stability by preventing the chair seat from collapsing upwardly if an extended force is applied downwardly on the rear of the seat, while the third embodiment provides the stability if the extended force is applied upwardly on the front. The center of gravity will be seen to be maintained in each, limiting any possible injury to a person sitting on the chair at such time.
These and other features of the present invention will be more clearly understood from a consideration of the following description, taken in connection with the accompanying drawings, in which:
In the prior art collapsible chair with a back of
When the chair is opened and sat upon, the upper side of the rear legs 2 are intended to sustain pressures produced upon the middle of the front legs 1.
However, experience has shown a deficiency of this construction in that if an extended force is downwardly applied on the back of the seats, the front side of the seat begins to rise so that the entire chair loses its center of gravity. As a result, as the chair begins to close, the connecting plate 4 could easily injure a person sitting on the chair as the chair begins to fold up.
The first two embodiments of the present invention, however, prevent the fold-up from happening. More specifically:
A. In the collapsible chair embodiment of
As more clearly shown in
With the middle of the support struts 30, 31 being pivotally connected together as at 35, and with their upper ends being pivotally connected to the seat support struts 14, 15, as at 36, 37, the front legs 10, 11, the rear legs 12, 13, the support struts 14, 15, and the support struts 40, 41 form two “X” configurations jointed by a hinge in the middle. More specifically, both lower ends of the “X” configurations are jointed with the two front legs, 10, 11 by hinges at 33, 34, and both upper ends of the “X” configurations are jointed with the support struts 14, 15 by the hinges 36, 37.
Such pivot or hinge connections will be understood to allow the middle part of the two front legs 10, 11 and the middle part of the two rear legs 12, 13 to be folded. Both upper ends of the cross support struts 30, 31 are bent and extend outwardly from the pivots 36, 37 at the seat support struts 14, 15 in forming an armrest for a cover for the seat. Such cover is shown at 50 in
A locking device for the slidesets 16, 17 is provided as it moves along the front legs 10, 11 towards the restrictor tubes 20. The locking device shown in
When the chair according to this embodiment is opened, a soft seating cover 50 can be put in place as previously mentioned. Once the chair is to be stored away, the cover 50 is removed, and the chair can then be folded on a central axis to arrive at the configuration of
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C. The embodiments of
While there have been described what are considered to be preferred embodiments of the present invention, it will be readily appreciated by those skilled in the art that modifications can be made without departing from the scope of the teachings herein. For example, although various components of the folding chair of the invention have been described as being in the form of struts, its will be acknowledged that such components could also be in the form of tubes, poles, bars or like metallic members—and the term “struts” is intended to apply to each. For at least such reason, therefore, resort should be had to the claims appended hereto for a true understanding of the scope of the invention.